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1.
A reference to the site tumblr.
A tumblrweed is a post on someone's blog that gets no likes, views, or any recognition atall.
For example, a 'supposed-to-be-funny' post that gets no laughs.
Guy 1: "Did you see that photo Dwayne put on tumblr last night?"
Guy 2: "Yeah, what a total tumblrweed."
by YankeeBastard August 31, 2010
 
2.
A person who is addicted to posting on their tumblr blog, they are out of control like a weed.
Ash: Did you just reblog me?

Kyri: Yeah man, I don't have any original thoughts of my own.

Ash: You sir are a tumblr weed.

Kyri: Damn :(
by followme May 22, 2011